Failed to process shard failure to potentially send back shard failure on corruption – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters a corruption in the shard data. This could be due to hardware failure, network issues, or a bug in Elasticsearch itself. To resolve this issue, you can try the following: 1) Restart the Elasticsearch node, 2) If the problem persists, you may need to restore the corrupted shard from a backup, 3) If the corruption is widespread, you might need to rebuild the entire index. Always ensure your data is regularly backed up to prevent data loss.

This log is related to search problems, in addition to reading the guide below you can use the free Search Log Analyzer. With Opster’s Analyzer, you can easily locate slow searches and understand what led to them adding additional load to your system. The tool is free and takes just 2 minutes to run.

Log Context

Log “failed to process shard failure to (potentially) send back shard failure on corruption” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            if (Lucene.isCorruptionException(exc)) {
                context.indexShard().failShard("search execution corruption failure"; exc);
        } catch (Exception inner) {
            logger.warn("failed to process shard failure to (potentially) send back shard failure on corruption"; inner);

    private void parseSource(DefaultSearchContext context; SearchSourceBuilder source; boolean includeAggregations) throws IOException {
        // nothing to parse...